We already know that Erin Andrews is replacing Brooke Burke-Charvet as sideline commentator on “Dancing With the Stars.” Now we’ll find out who the celebrity hoofers will be when the cast for the 18th season is revealed on “Good Morning America.” Fingers crossed for Maggie Smith. 7 a.m., KSTP, Ch. 5

The Harold

The late Harold Ramis directed some great movies, but he could also be a hilarious on-screen sidekick, as was the case in 1981’s “Stripes,” which he co-wrote. His reactions to Bill Murray’s antics are original and smart. He will be missed. 6:10 p.m., Starz.

Heeeere’s Johnny!

Conan O’Brien continues to be reminded that he lost “The Tonight Show” by hosting a second batch of “Carson on TCM,” short excerpts of classic interviews conducted by the master, Johnny Carson. First up: conversations with James Stewart, Jack Lemmon, Sally Field, Diane Keaton, Angie Dickinson and Sammy Davis Jr. 7 p.m., TCM

Minneapolis performing artist Patrick Scully brings the Mississippi River Boat Ballet to the festival. No art form requires more precision than ballet, so it's anyone's guess how Scully plans to keep nearly 50 boats; sailboats, kayaks, rowing shells, even a couple of bicycle-powered pontoons in balance, here are highlights from the rehearsal.